Geochronology, geochemistry and petrogenesis of the tungsten-bearing porphyritic granite in the Dahutang tungsten deposit, Jiangxi Province
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摘要: 在江西大湖塘地区发现具有高钨含量的花岗斑岩体，钨含量是普通花岗岩的几十甚至上百倍。本文对该富钨花岗斑岩进行了详细的锆石U-Pb年代学、主量元素、微量元素以及Nd-Hf同位素研究。LA-ICP-MS锆石U-Pb定年法测得大湖塘花岗斑岩成岩年龄为134.6±1.2Ma。岩相学和岩石地球化学研究表明这种花岗斑岩属于高分异的S型花岗岩，具有高硅，富碱，过铝质，较高的Ga/Al值，锆饱和温度低，轻重稀土分馏明显，Eu负异常明显的特点。大湖塘富钨花岗斑岩的εNd（t）值和锆石εHf（t）值分别变化于-7.45~-8.20，-2.43~-8.23之间，两阶段Nd 和Hf模式年龄分别为tDMC（Nd）=1534~1595Ma，tDMC（Hf）=1312~1677Ma。结合其CaO/Na2O值都小于0.3，本文认为它的源区很可能来源于双桥山群的泥质变质沉积岩。这种富钨花岗斑岩有富Li、Rb，贫Ba、Zr，ΣREE含量低，GCI值大于零的特征。Ba/Rb6可作为富钨花岗岩的判别标志而与贫钨的花岗岩区分开来。富钨的双桥山群泥质变质岩部分熔融可初步形成富钨的花岗岩浆，岩浆在高度结晶分异过程中则可使得钨进一步富集在花岗斑岩岩浆热液中并进一步形成了超大型的大湖塘钨矿床。Abstract: The porphyritic granite containing high tungsten content (typically several hundreds of ×10-6) is discovered in the Dahutang area, Jiangxi Province, South China. The tungsten content is dozens to hundreds of times higher than the normal barren granites. In this paper, we reported detailed studies on the LA-ICP-MS zircon U-Pb dating, major elements, trace elements, zircon Hf isotopic compositions and whole-rock Nd isotopic compositions of the tungsten-bearing porphyritic granite. The studies of petrography and geochemistry of this rock indicate that it is highly fractional S-type granite, possessing the characteristics of silica-rich, high alkalinity, high Ga/Al ratios, low zircon saturation temperatures, enrichment in LILEs and depletion in HFSEs and significant negative Eu anomalies. Hence, this rock belongs to peraluminous granite. Its εNd(t) and εHf(t) values varied from -7.45 to -8.20 and from -2.43 to -8.23, respectively, and the calculated two-stage model ages (tDMC) of Nd and Hf isotopes are as 1534~1595Ma and 1312~1677Ma, respectively. Coupled with the values of CaO/Na2O (0. The values of Ba/Rb6 can be used to distinguish the tungsten-bearing granite from the barren granite. It is likely that the magma had extracted tungsten from the tungsten-rich Shuangqiaoshan Group metasedimentary rocks during partial melting of these source rocks. Extreme fractional crystallization resulted in further enrichment of tungsten in the evolved granitic magma which led to later precipitation of tungsten from the magmatic-hydrothermal fluids.
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Key words:
- Zircon U-Pb dating /
- Nd-Hf isotopes /
- Geochemistry /
- Porphyritic granite /
- Dahutang tungsten ore deposit
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